This reference contains the imagery data used in the completion of the baseline vegetation inventory project for the NPS park unit. Orthophotos, raw imagery, and scanned aerial photos are common files held here.

Delineation of vegetation map classes was based on interpretation of digital aerial imagery utilizing additional digital and non-digital data sources. The primary imagery used as base layers for mapping were the digital orthophoto mosaics of leaf-off color infrared aerial photography flown for this project in March 2003 and leaf-on color infrared aerial photography flown for this project in October 2004. Additional digital aerial imagery sets which were used included leaf-off color infra-red digital orthophoto quarter quads flown in spring 1996 (USGS 1995) and true color leaf-off orthophoto quarter quads flown in spring 2003 (WVSAMB 2005).

Transparencies of leaf-on color infrared aerial photography flown in October 2003 (Vanderhorst et al. 2007) and the original transparencies used to produce the orthophoto mosaics for this project were examined on a light table to help distinguish signatures which were not apparent on the digital imagery. Utilization of these multiple sets of aerial photography often helped to overcome deficiencies (e.g. shading) of the primary orthophoto mosaics. Ancillary GIS layers used to assist photointerpretation included digital rastor graphs of USGS topographic maps and the landform and Ecological Land Unit models developed for this project.